Unfortunately, the power company is still expected to make sure that the power comes in at the right voltage and frequency. And with control on only part of the inputs, that's a lot harder. The fewer inputs they control, the harder...
Yeah, but as it turns out, they're not actually very good at it. Any inverter worth more than a couple hundred bucks is better at producing a reliable sine wave than PG&E, for example.
As the amount of electricity you draw from their generators goes down, they're going to reach the point of needing to charge you a flat fee just for the connection to the power lines,
I sure hope it's a flat fee. I live in the sticks.